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<?php /** * CodeIgniter * * An open source application development framework for PHP * * This content is released under the MIT License (MIT) * * Copyright (c) 2014 - 2019, British Columbia Institute of Technology * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * * @package CodeIgniter * @author EllisLab Dev Team * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/) * @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/) * @license https://opensource.org/licenses/MIT MIT License * @link https://codeigniter.com * @since Version 3.0.0 * @filesource */ defined('BASEPATH') OR exit('No direct script access allowed'); /** * PHP ext/hash compatibility package * * @package CodeIgniter * @subpackage CodeIgniter * @category Compatibility * @author Andrey Andreev * @link https://codeigniter.com/user_guide/ * @link http://php.net/hash */ // ------------------------------------------------------------------------ if (is_php('5.6')) { return; } // ------------------------------------------------------------------------ if ( ! function_exists('hash_equals')) { /** * hash_equals() * * @link http://php.net/hash_equals * @param string $known_string * @param string $user_string * @return bool */ function hash_equals($known_string, $user_string) { if ( ! is_string($known_string)) { trigger_error('hash_equals(): Expected known_string to be a string, '.strtolower(gettype($known_string)).' given', E_USER_WARNING); return FALSE; } elseif ( ! is_string($user_string)) { trigger_error('hash_equals(): Expected user_string to be a string, '.strtolower(gettype($user_string)).' given', E_USER_WARNING); return FALSE; } elseif (($length = strlen($known_string)) !== strlen($user_string)) { return FALSE; } $diff = 0; for ($i = 0; $i < $length; $i++) { $diff |= ord($known_string[$i]) ^ ord($user_string[$i]); } return ($diff === 0); } } // ------------------------------------------------------------------------ if (is_php('5.5')) { return; } // ------------------------------------------------------------------------ if ( ! function_exists('hash_pbkdf2')) { /** * hash_pbkdf2() * * @link http://php.net/hash_pbkdf2 * @param string $algo * @param string $password * @param string $salt * @param int $iterations * @param int $length * @param bool $raw_output * @return string */ function hash_pbkdf2($algo, $password, $salt, $iterations, $length = 0, $raw_output = FALSE) { if ( ! in_array(strtolower($algo), hash_algos(), TRUE)) { trigger_error('hash_pbkdf2(): Unknown hashing algorithm: '.$algo, E_USER_WARNING); return FALSE; } if (($type = gettype($iterations)) !== 'integer') { if ($type === 'object' && method_exists($iterations, '__toString')) { $iterations = (string) $iterations; } if (is_string($iterations) && is_numeric($iterations)) { $iterations = (int) $iterations; } else { trigger_error('hash_pbkdf2() expects parameter 4 to be long, '.$type.' given', E_USER_WARNING); return NULL; } } if ($iterations < 1) { trigger_error('hash_pbkdf2(): Iterations must be a positive integer: '.$iterations, E_USER_WARNING); return FALSE; } if (($type = gettype($length)) !== 'integer') { if ($type === 'object' && method_exists($length, '__toString')) { $length = (string) $length; } if (is_string($length) && is_numeric($length)) { $length = (int) $length; } else { trigger_error('hash_pbkdf2() expects parameter 5 to be long, '.$type.' given', E_USER_WARNING); return NULL; } } if ($length < 0) { trigger_error('hash_pbkdf2(): Length must be greater than or equal to 0: '.$length, E_USER_WARNING); return FALSE; } $hash_length = defined('MB_OVERLOAD_STRING') ? mb_strlen(hash($algo, NULL, TRUE), '8bit') : strlen(hash($algo, NULL, TRUE)); empty($length) && $length = $hash_length; // Pre-hash password inputs longer than the algorithm's block size // (i.e. prepare HMAC key) to mitigate potential DoS attacks. static $block_sizes; empty($block_sizes) && $block_sizes = array( 'gost' => 32, 'haval128,3' => 128, 'haval160,3' => 128, 'haval192,3' => 128, 'haval224,3' => 128, 'haval256,3' => 128, 'haval128,4' => 128, 'haval160,4' => 128, 'haval192,4' => 128, 'haval224,4' => 128, 'haval256,4' => 128, 'haval128,5' => 128, 'haval160,5' => 128, 'haval192,5' => 128, 'haval224,5' => 128, 'haval256,5' => 128, 'md2' => 16, 'md4' => 64, 'md5' => 64, 'ripemd128' => 64, 'ripemd160' => 64, 'ripemd256' => 64, 'ripemd320' => 64, 'salsa10' => 64, 'salsa20' => 64, 'sha1' => 64, 'sha224' => 64, 'sha256' => 64, 'sha384' => 128, 'sha512' => 128, 'snefru' => 32, 'snefru256' => 32, 'tiger128,3' => 64, 'tiger160,3' => 64, 'tiger192,3' => 64, 'tiger128,4' => 64, 'tiger160,4' => 64, 'tiger192,4' => 64, 'whirlpool' => 64 ); if (isset($block_sizes[$algo], $password[$block_sizes[$algo]])) { $password = hash($algo, $password, TRUE); } $hash = ''; // Note: Blocks are NOT 0-indexed for ($bc = (int) ceil($length / $hash_length), $bi = 1; $bi <= $bc; $bi++) { $key = $derived_key = hash_hmac($algo, $salt.pack('N', $bi), $password, TRUE); for ($i = 1; $i < $iterations; $i++) { $derived_key ^= $key = hash_hmac($algo, $key, $password, TRUE); } $hash .= $derived_key; } // This is not RFC-compatible, but we're aiming for natural PHP compatibility if ( ! $raw_output) { $hash = bin2hex($hash); } return defined('MB_OVERLOAD_STRING') ? mb_substr($hash, 0, $length, '8bit') : substr($hash, 0, $length); } }